# randU256

> **randU256**(): `bigint`

Defined in: [packages/synapse-core/src/utils/rand.ts:15](https://github.com/FilOzone/synapse-sdk/blob/ce46a7c7064e0127711218b664e222c63ce5d42e/packages/synapse-core/src/utils/rand.ts#L15)

## Returns

`bigint`

a random unsigned big integer between `0` and `2**256-1` inclusive